The regulation of ketogenesis.
Level 5 - mechanism / opinion, no new human data
Narrative review detailing biochemical mechanisms without primary human trial data
PubMed 6122545 · doi:10.1002/9780470720691.ch7
What was done
This is a narrative review describing the hormonal and biochemical mechanisms governing hepatic ketogenesis during fasting and uncontrolled diabetes.
What was found
The abstract reports no numerical values or experimental statistics. It describes the regulatory pathway: an increased glucagon-to-insulin molar ratio stimulates lipolysis in adipose tissue, increasing plasma free fatty acids for liver uptake. Glucagon lowers hepatic malonyl-CoA by inhibiting glycolysis and acetyl-CoA carboxylase. The drop in malonyl-CoA relieves inhibition on carnitine acyltransferase I, allowing long-chain fatty acid entry into mitochondria for rapid oxidation to ketone bodies. Refeeding or insulin administration reverses this cascade by increasing malonyl-CoA and inhibiting carnitine acyltransferase I.
Why it matters
It outlines the fundamental biochemical mechanism by which insulin deficiency and glucagon drive hepatic ketone body production via carnitine acyltransferase I regulation.
Limits
The record is a narrative review presenting mechanistic pathways with no primary empirical dataset, sample size, or quantitative clinical outcomes.
Cited by
- supports Individuals with inborn carnitine deficiency may need carnitine supplementation to achieve a low Glucose Ketone Index.